The background:Luke and Tess Pretty, a brother and sister act from Canada, are 15 and 17, or 16 and 18. Something like that. Not that it really matters. It’s not as though they’re a new Arctic Monkeys or anything – they don’t make “youth” their thing, their raison d’être or lyrical focus. They don’t sing about riot vans or mardy bums. In fact, they don’t sing about anything – their music is instrumental. And it is madly busy, chock-full of keyboard twiddles and brrrrps, glissandos, arpeggios or whatever sounds happen to be at hand. Such as, say, the caution beep of a car safety belt alarm when someone is sitting in their seat and they’ve forgotten to strap in.

They use that really rather annoying tone, in the form of a loop, as the basis for what is a very lovely electronic lullaby – their latest track Lay-By. You'll either find it infuriating or intoxicating. Or it will make you want to go for a spin (but buckle-up first). The track also features manic laughter and a part that opens into a starburst of synthy colours and flavours. It is positively synaesthetic. The duo posted it on SoundCloud with the message: “Hey. I hope this song reminds you to slow down. Sometimes the dark can be beautiful.” Who knows what they mean – nor why they’re called Tennyson and not, for example, Pretty – but if they keep making music as fine as Lay-By, we’re not bothered.

So far, because of their age, they have either been treated dismissively: “It’s like the Series of Unfortunate Events siblings started an electronica band﻿,” according to one review. Or they've been greeted with something approaching awe. “He's in the same league with artists such as Mount Kimbie and Flying Lotus. This guy has raw talent,” gasped a fan after watching Luke Pretty do his virtuosic and eclectic thing at a live show, which should please Luke no end because Flying Lotus is one of his influences – along with Aphex Twin, Boards of Canada, Bonobo, James Blake, Lapalux, and Cashmere Cat.

The pair reportedly began busking in Edmonton from the age of seven and nine, playing covers of songs by the Beatles, Coldplay and Weezer. By the time Luke was 12 they had recorded two albums of jazz music. In 2012, he produced his first release of original (electronic) material, and this year he decided to combine his love of jazz and electronica, with his sister on drums.

The results are all over their SoundCloud page. There’s You’re Cute, which drew the attention of Ryan Hemsworth (see New band of the week No 1,377), who may or may not be signing them to his Secret Songs label. The song For You features a sylph-soft female voice effecting a Björk/Therese Bazaar hybrid over warped, jazzy, electronic neo-lounge muzak, like Weather Report left out in the sun to warp. There’s the itchy, glitchy 2step/R&B of No Answer and Nightly, the smeared, spacey Violet Alturas, which recalls Odd Future’s Jet Age of Tomorrow offshoot. There’s Aphasia Rewinding, which combines melody and bravura beat science (there’s also a track called Bravura, by the way). And there’s DJ Shadow homage the Usual Mr Nordin. To the Moon (and Back), meanwhile, is an affecting departure into sad Erik Satie-esque sad piano music. It’s all good, basically, and obviously immensely impressive, nevermind their ages.